.admin {
  max-width: 999px;
  width: 100%;
  height: 100%;
  margin: 0 auto;
  background-image: url("./images/bg.jpg");
  .layout {
 
    .header {
      width: 100%;
      height: 140px;
      
      .title {
        width: 999px;
        height: 100px;
        margin-left: -50px;
        .img{
            width: 100%;
            height: 100%;
        } 
      }

      .navi{
        width: 999px;
        height: 40px;
        margin-left: -50px;
          .menu{
            width: 100%;
            height: 100%;
          }
      }

    }
    .content {
        width: 100%;
        height: 800px;
        background-color: antiquewhite;
    }
    .footer {
        width: 100%;
        height: 50px;
        background-color: blueviolet;
    }
  }
}

li{
    height: 40px;
    width: 111px;
    text-align :center;
    padding-bottom:auto;
    line-height:40px;
    background-color: rgb(100, 159, 237);
    border: 1px solid white;
    background-image: linear-gradient(#3431eb, #0526a7);
    font-size: 15px;
    font-family: 'SimHei';
    color: rgb(255, 255, 255);
    
}

#first{
    border-top-left-radius:10px;
    border-bottom-left-radius: 10px;
}

#last{
    border-top-right-radius: 10px;
    border-bottom-right-radius: 10px;
}